docs: update forum references

CONTRIBUTING.adoc

@@ -5,9 +5,9 @@ Here are few guidelines that should help you get started.
 
 == Using GitHub issues
 
-We use GitHub issues to track bugs and enhancements. Found a bug in the source code? You want to propose new features or enhancements  You can help us by submitting an issue in our https://github.com/gravitee-io/gravitee-policy-cors[repository]. Before you submit your issue, search the https://github.com/gravitee-io/issues/issues[issues archive] or the https://waffle.io/gravitee-io/release[backlog]; maybe your question was already answered.
+We use GitHub issues to track bugs and enhancements. Found a bug in the source code? You want to propose new features or enhancements  You can help us by submitting an issue in our https://github.com/gravitee-io/gravitee-policy-jwt[repository]. Before you submit your issue, search the https://github.com/gravitee-io/issues/issues[issues repository]; maybe your question was already answered.
 
-> Issues are only to report bugs, request enhancements, or request new features. For general questions and discussions, use the https://gitter.im/gravitee-io/gravitee-io[Gravitee.io Gitter chat].
+> Issues are only to report bugs, request enhancements, or request new features. For general questions and discussions, use the image:https://f.hubspotusercontent40.net/hubfs/7600448/gravitee-github-button.jpg["Join the community forum", link="https://community.gravitee.io?utm_source=contributing", height=20].
 
 Providing the following information will help us to deal quickly with your issue :